As long as there is no major rectification, it is usually done every day!
I have been to three Tianguang markets in Guangzhou, Guangta Road, North and Haizhu Bridge.
Tianguang Market on Guangta Road, near Exit A of Ximenkou subway, is mainly composed of calligraphy and painting antiques from 4 am to 6 am on Saturday.
In the two markets of North and Haizhu Bridge, many people who sell goods make a living by collecting junk, and many people who visit the market are students. In fact, there is nothing to visit in the north.